Strong but Light: Material Trade-offs

How this works

1. 1Read the short explanations first — they teach you what you need before each question.
2. 2Answer each question, then tap Check. A right answer moves you on automatically; if it's wrong, you'll see a friendly explanation of why.
3. 3Finish all 3 steps to see your score — sign in and subscribe to unlock the full lesson and save it.

What's inside

7 questions and 1 quick teaching card, including:

• 🔘Multiple choice — Tap the answer you think is best, then check it.
• ⚖️True or false — Read the statement and decide if it's true or false.

👪Grown-up tip: sit alongside younger learners for the first few lessons. Read the questions together and chat about the explanations — that's where the real learning sticks.